Some gay guys dislike bi guys because they believe our struggle is not the same, and that part of being in the LGQBT is the shared sense of homophobia that is felt among the group. One such argument is that we as bi, can just hide our gay side and blend in. And that therefore, our claim to LGQBT "perks" is not earned and that we are just imposters. That of course is just plain nonsense and bi erasure to the core, but that is the thought process.
For some bi people, yes we can do that. But a lot of people forgot that not all bi men are "straight men" that also like dick. We too, in the bi community, can be very effeminate. Femboys are not unique to just gay men. Many bi people would love to paint their nails black or dress more androgynous. Hiding that part of yourself is not blending in, it's masking, which is the same thing gay people that are closeted have to do.
And even though of us are who "straight" presenting, it sucks having to hide who we are. I am mostly closeted, and the amount of people who throw straight stuff at me for being a "straight man" just don't get me, but I mask as a straight man and just go with the flow.
Lastly, and this I can understand more, though I disagree with it -- some gay men do not like bi men because they are fearful of losing us to a woman. A woman can offer us something a man never can (and vice versa), and for some gay men, that makes them uncomfortable.
Straight women can also be very biphobic too, mainly because sexist nonsense about preferring to be with a "real man". Rubbish and nonsense of course and these types of sexist people are to be avoided, but nonetheless, this is something we sometimes have to deal with.
For many bi people, part of the bi experience is not being straight enough for straight people, and not being gay enough for gay people.
